I would not chase after a systems with a screen resolution higher than 1920x1080. (ala the Retina Macs) You will just have to scale to higher DPIs to be able to see anything. I think it's a bit of a marketing spec rather than a real differentiator.

Here is a sample system that is very powerful, certainly a match for any Macbook. 15 inch IPS 1080P screen with a high end core i7 and under 5 pounds. 500GB storage with Hybrid SSD for the OS. I think Apple markets this as Fusion Drive. $1350